linux-kernel - Re: [PATCH 6/6] ARM: dts: Add pcie controller node for Samsung EXYNOS5440 SoC

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Message-Id: <201306071943.18407.arnd@arndb.de>
Date:	Fri, 7 Jun 2013 19:43:18 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Jingoo Han <jg1.han@...sung.com>,
	"'Thomas Petazzoni'" <thomas.petazzoni@...e-electrons.com>,
	linux-samsung-soc@...r.kernel.org,
	"'Siva Reddy Kallam'" <siva.kallam@...sung.com>,
	"'Surendranath Gurivireddy Balla'" <suren.reddy@...sung.com>,
	linux-pci@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	"'Thierry Reding'" <thierry.reding@...onic-design.de>,
	linux-kernel@...r.kernel.org,
	"'Grant Likely'" <grant.likely@...retlab.ca>,
	"'Kukjin Kim'" <kgene.kim@...sung.com>,
	"'Thomas Abraham'" <thomas.abraham@...aro.org>,
	"'Bjorn Helgaas'" <bhelgaas@...gle.com>,
	"'Andrew Murray'" <andrew.murray@....com>
Subject: Re: [PATCH 6/6] ARM: dts: Add pcie controller node for Samsung EXYNOS5440 SoC

On Friday 07 June 2013, Jason Gunthorpe wrote:
> Sounds fair to me.
> 
> But when we talk about multiple domains we don't mean a disjoint range
> bus bus numbers, as your other email shows:
> 
> 00:00.0 PCI bridge: Samsung Electronics Co Ltd Device a549 (rev 01) (prog-if 00 [Normal decode])
> 10:00.0 PCI bridge: Samsung Electronics Co Ltd Device a549 (rev 01) (prog-if 00 [Normal decode])
> 
> We mean multiple domains, it should look like this:
> 
> 0000:00:00.0 PCI bridge: Samsung Electronics Co Ltd Device a549 (rev 01) (prog-if 00 [Normal decode])
> 0001:00:00.0 PCI bridge: Samsung Electronics Co Ltd Device a549 (rev 01) (prog-if 00 [Normal decode])
> 
> ie lspci -D.
> 
> Each domain gets a unique bus number range, config space, io range,
> etc. This is much clearer to everyone than trying to pretend there is
> only one domain when the HW is actually multi-domain.

Yes, absolutely. This means we also don't need a bus-range property in DT, since each
domain will allow all 255 buses.

	Arnd
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